Hi there, I just picked up some.430 320gr. WLNGC from Cast performance, the load notes inside call for 19 grains of W-296. I was wondering if anyone has used H-110 with these bullets, and if so what was the min. charge. I thought it might be safe to start at 19 grains of H-110 but it is better to be safe.

Same here. Often the 296 performs more consistently than the 110, but "each gun is a law unto its own" and so is powder. Try the Mag primers also, and see if there is a significant differnece in velocity (drop charge first)

I second the thought of starting at 18 grains and working up.
I've also heard that H110 and W296 are one and the same, but load books do not treat them the same.
Starting 5% under, which at 19grains is 18grains is a safe thing to do.

Large magnum primers, use one lot of brass, and start from a clean gun.
Usual round of suspects to check for overpressure... flattened primers, hard extraction, etc.

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